Roll wiper



H.--O. M INTIRE 2,357,963

RoLL' WIPER 3 Shee ts-Sheet 3 SepL 12, 1944.

NR R xx, F

. Q Q Q NW Q lllll ll lllllllllillllllll Patented Sept. 12, 1944 ROLL WIPER Hoy 0. McIntire, Gary, Ind., assignor to Carnegie- Illinois Steel Corporation, a corporation of New Jersey Application December 18, 1942, Serial. No. 469,488

9 Claims.

This invention relates to a roll wiper, and more particularly to such wipers as are used for wiping the feed-out rolls of hot dipped tinning machines. In the hot dip process of tinning steel sheets, the uncoated sheets are passed by means of rolls downward through a layer of flux into a bath of molten tin. The sheets are fed along through the tin by the rolls into a second compartment. Floating on the tin in this compartment is a deep layer of oil which protects the tin coatin against oxidation until cooled. In this oil there are threesets of rolls arranged in a vertical column. The purpose of these rolls is to carry the plate up through the oil onto a conveyor, and to remove exces tin from the sheets.

In order to obtain a uniform thin coating of tin it is necessary to devise some means for removing additional tin from the sheets. This is done by using a wiper under, and extending the length of, each of the rolls. Continuous removal of the tin from the rolls permits them to remove more tin from the sheets. The amount of tin removed from the rolls can be varied by increasing or decreasing the pressure of the wipers. With the present wiper construction there, are hangers at each end and at the center of the bot tom and middle wipers. Some of the top wipers have three and some fiv hangers. The top ends of these hangers are threaded and extend above the oil level. A nut provided with a washer and spring on the end of each hanger provides the means for adjustment. With so many points of adjustment for each wiper, some of which are in almost inaccessible places, uniform adjustment throughout the length of the wiper is difficult. The wipers will bear more at one point than another and thus obtain a coating which is not uniform in thickness.

It is an object of this invention to make wiper adjustment easier and more uniform.

Another object is to increase the useful life of the tinning machine. I

A further object is to reduce tin consumption.

These and other objects will be apparent after referring. to the following specification and attached drawings in which:

Fig. 1 is an elevation of the invention;

Fig. 2 is a sectional view on the line 11-11 of Fig. 1; and

Fig. 3 is a top view.

Referring more particularly to the drawings, the reference numeral 2 indicates the end housings of a coating machine in which is journaled a plurality of driven rolls 4. The coated sheet leaving the first compartment of the tinning machine is guided by means of guide 6 upwardly between the rolls 4 which remove the excess tin from the sheet. The wipers 8 remove the tin which sticks to the rolls 4 and thus enables the rolls to remove more tin from the sheet. The wipers are made of soapstone or asbestos held in a channel 9 for rigidity. Each of the bottom Wipers is supported by means of a rigid triangular hanger formed of two rods I ll, fastened to the wiper adjacent the ends thereof and a third rod l2 fastened to the wiper midway of the ends and to which the rods I0 are fastened at a point near the top of the machine. In like manner the "middle and top wipers are supported by rigid triangular hangers formed of rods l4, l6 and I8, 20, respectively. Guide plates 22 and 24 having guide holes 26 are securely fastened to the top of the machine. The rods I2, [6 and 2!! extend upwardly through, and are guided in their vertical movement by means of the guides 26. Due to their length, the hangers for the'bottom wiper may tend to buckle or bend when placed under tension. Guide rods 28 extending between the end housings 2 will prevent such buckling.

In order to adjust the pressure at which the wiper is pressed against the rolls, each of the hangers is adjustable vertically by means of a lever 38. Each of the levers 30 is pivotly mounted on a rod 32, supported on bracket 34. One end of the lever is provided with a flattened portion 36 having a hole 38 through which the middle rod of the hanger extends. 1A sleeve 40 on the rod engages the top surface of the flattened portion 36 and i retained on the rod by means of nut 42. The other end of the lever extends to the side of the machine where pressure is applied thereto. The means for applying pressure consists of a screw threaded rod 44 attached to the housing and extending through a hole 46 in the lever. A nut 48 is screwed on the rod 44 and holds a spring 50 in engagement with the lever.

If it is desired to increase the pressure of one of the wipers against the roll, it is only necessary to screw the nut 48 further on the rod 44. This raises the hanger and thereby increases the pressure. The spring protects the roll and wiper from damage since it permits the wiper to recede from the roll if foreign matter comes between the roll and wiper. The nut 42 provides an additional adjustment, but will be used mainly for adjustments of a permanent nature.

While one embodiment of the invention has been disclosed, it will be apparent to one skilled in the art that other modifications may be made without departing from the scope of the following claims.

I claim:

1. In a tin coating machine having a plurality of pairs of rolls for removing excess tin from a coated article, the combination comprising a wiper for each roll, members connected to each wiper at a plurality of points along its length, said members'being joined a substantial distance above the last named wiper at a point substantially on the center line of the machine to form a rigid hanger, and means connected to said hanger at said point for raising and lowering said hanger.

2. In a tin coating machine having a plurality of pairs of rolls for removing excess tin from a coated article, the combination comprising a Wiper for each roll, members connected to each wiper at a plurality of points along its length, said members being joined a substantial distance above the last named wiper at a point substantially on the center line of the machine to form a rigid hanger, means connected to said hanger at said point and extending above the top of the machine, and means for actuating said means to raise and lower said hanger.

3. In artin coating machine having a plurality of pairs of rolls for removing excess tin from a coated, article, the combination comprising a Wiper for each roll, members connected to each Wiper at a plurality of points along its length, said members being joined at a point substantially on the center line of the machine to form a rigid hanger, means connected to said hanger at said point and extending above the top of the machine, and means operable from a side of the machine for actuating said means to raise and lower said hanger.

.4. In a, tin coating machine having a plurality of pairs of rolls for removing excess tin from a wiperfor each roll, members connected to each wiper at a plurality of points along its length, said machine, ,and resilient means for actuating said means ,to raiseand lower said hanger,

5. In a tin coating machine having a plurality of pairs of rolls for removing excess tin from a coated, article, the combination comprising a wiper for each roll, a, rod connected to each end of each Wiper, a third rodconnected to each wiper at the center thereof and extending above the located article, the combination comprising a' r top of the machine, said first named rods-being connected to said third rod intermediate the ends thereof, a pivot rod between the center and one side of the machine, a lever pivotly mounted thereon and adapted to engage the upper end of said third rod, said lever extending to said side of the machine, and means for resiliently applying pressure to the free end of said lever.

' 6. In a tin coating machine having a plurality of pairs of rolls for removing excess tin from a coated article, the combination comprising 'a wiper for each roll, a rod connected to each end of each wiper, a third rod connected to each wiper at the center thereof and'extending above the top of the machine, said first named rods being connected to said third rod intermediate the ends thereof to form a rigid hanger, and means operable from a remote position for raising and lowering said hanger.

7. In a tin coating machine having a plurality of pairs of rolls for removing excess tin from a coated article, the combination comprising a' wiper for each roll, a rod connected to each end of each wiper, a third rod connected to each wiper at the center thereof and extending. above the'top of the machine, said first named rods being connected to said third rod intermediate the ends thereof to form a rigid hanger, and resilient means operable from a remote position for raising and lowering said rods.

8. In a tin coating machine having a plurality of pairs of rolls for removing excess tin. from a coated article, the combination comprising a wiper for each roll, a rod connected to each end of each wiper, a third rod connected to each wiper at th center thereof and extending above the top of the machine, said first named rods being connected to-said third rod intermediate the ends thereof to form a rigid'hanger, a guide for each of said third rods located near the top of the machine, a second guide for at least one of said third rods located intermediate the ends thereof, a sleeve mounted on each of saidthird rods adjacent the top thereof, a pivot rod between the center and one side of the machine, a lever pivotly mounted thereon and adapted to engage said sleeve, said lever extending to said side of the machine, and means for resiliently. applying pressure to the freeend of said lever. 9. In a tin coating machine having aplurality of pairs of rolls for removing excess tin from a 

